Tunable active filter

Abstract

The invention provides a tunable active filter which comprises a light polarization input control unit, a magnetic filter body and a magnetic field loading unit, wherein the light polarization input control unit is used for converting input light into TM-mode polarized light which incomes in the K direction, the magnetic filter body is arranged at the rear end of an optical path of the light polarization input control unit and prepared through magnetic materials and dielectric substances, the magnetic filter body is of a periodic Bragg structure which has defects, extends in the K direction and is used for filtering the polarized light which incomes from the light polarized input control unit by means of a transmission peak generated by the defects of the periodic Bragg structure, and the magnetic loading unit is used for generating a magnetic field which is perpendicular to the K direction and the incident polarized light electric field direction and modulating the position of the transmission peak generated by the defects of the Bragg structure. The tunable active filter is easy to manufacture, quick in response, flexible in tuning process and high in tuning precision.

Description

technical field [0001] The invention relates to the technical field of optical filters, in particular to a tunable active filter. Background technique [0002] The development of optical communication networks and optical information processing is inseparable from high-efficiency, low-energy consumption, and highly integrated optical devices, such as: optical switches, optical modulators, filters, etc., among which filters are indispensable optical devices. [0003] But most of the filters are based on the optimization of the device structure to achieve the filtering function. Such as introducing resonant rings, rectangular grooves, etc. into the optical waveguide. Once the device structure of this type of filter is designed, the filtering characteristics of the device are fixed. If filters with different wavelengths need to be designed in optical integrated circuits, structures with different sizes need to be designed, which is extremely unfavorable to the operability of ...

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Problems solved by technology

[0004] However, in the process of realizing the present invention, the applicant found that the existing tunable active filters, such as: tunable active filters using mechanical and temperature tunable filters, are difficult to manufacture, and the tuning process is complicated. The response time is long, the tuning range is limited, the tuning accuracy is difficult to guarantee, and it is difficult to set the device parameters subjectively according to the needs

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